<template>
  <div> <!--面包屑导航区-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图区-->
    <el-card>
      <!--提示区-->
      <el-alert
        title="添加商品信息"
        :closable="false"
        type="info"
        center
        show-icon>
      </el-alert>
      <!--步骤条区-->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!--tab栏区域-->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTableLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">基本信息
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_name">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="catelist"
                expand-trigger="hover"
                :props="cateProps"
                @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!--渲染表单的Item项-->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!--复选框组-->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox border :label="cb" v-for="(cb,i) in item.attr_vals" :key="i"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals">
              </el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!--action表示图片要上传的后台API地址-全路径-->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture" :headers="headerObj" :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!--富文本编辑器组件-->
            <quill-editor v-model="addForm.goods_introduce">
            </quill-editor>
            <!--添加商品按钮-->
            <el-button type="pr imary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!--图片预览-->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>


  </div>
</template>

<script>

  import _ from 'lodash'

  export default {
    created() {
      this.getCateList();
    },
    data() {
      return {
        activeIndex: '0',
        // 添加商品的表单数据对象
        addForm: {
          goods_name: '',
          goods_price: 0,
          goods_weight: 0,
          goods_number: 0,
          // 商品所属的分类数组
          goods_cat: [],
          // 图片数组
          pics: [],
          // 商品的详情描述
          goods_introduce: '',
          attrs: []
        },
        // 动态参数列表数据
        manyTableData: [],
        // 静态属性列表数据
        onlyTableData: [],
        addFormRules: {
          goods_name: [
            {required: true, message: '请输入商品名称', trigger: 'blur'}
          ],
          goods_price: [
            {required: true, message: '请输入商品价格', trigger: 'blur'}
          ],
          goods_weight: [
            {required: true, message: '请输入商品重量', trigger: 'blur'}
          ],
          goods_number: [
            {required: true, message: '请输入商品数量', trigger: 'blur'}
          ],
          goods_cat: [
            {required: true, message: '请选择商品分类', trigger: 'blur'}
          ]
        },
        // 商品分类列表
        catelist: [],
        cateProps: {
          label: 'cat_name',
          value: 'cat_id',
          children: 'children'
        },
        // 上传图片的URL地址
        uploadURL: `http://39.105.42.229:8888/api/private/v1/upload`,
        // BaseURL地址
        baseURL: `http://39.105.42.229:8888/`,
        // 图片上传组件的header请求头对象
        headerObj: {
          Authorization: window.sessionStorage.getItem('token')
        },
        previewPath: '',
        previewVisible: false
      }
    },
    methods: {
      // 获取所有商品分类数据
      async getCateList() {
        const {data: res} = await this.$http.get(`categories`)
        if (200 !== res.meta.status) {
          return this.$message.error('获取商品分类数据失败！')
        } else {
          this.catelist = res.data
          if (this.addForm.goods_cat.length !== 3) {
            this.addForm.goods_cat = []
          }
        }
      },
      // 级联选择器选中变化，会触发这个函数

      handleChange() {
        console.log(this.addForm.goods_cat)
      },
      beforeTableLeave(activeName, oldActiveName) {
        if ('0' === oldActiveName && this.addForm.goods_cat.length !== 3) {
          this.$message.error('请选择商品分类！')
          return false
        }
      },
      async tabClicked() {
        // 证明访问的是动态参数面板
        if (this.activeIndex === '1') {
          const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: 'many'}})
          if (200 !== res.meta.status) {
            return this.$message.error('获取动态参数列表失败！')
          } else {
            res.data.forEach(item => {
              item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
            })
            this.manyTableData = res.data
          }
        } else if (this.activeIndex === '2') {
          const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: 'only'}})
          if (200 !== res.meta.status) {
            return this.$message.error('获取静态属性失败！')
          } else {
            this.onlyTableData = res.data
            this.$message.success('获取静态属性成功！')
          }
        }
      },
      // 处理图片预览效果
      handlePreview(file) {
        this.previewPath = this.baseURL + file.response.data.tmp_path
        this.previewVisible = true

      },
      // 处理移除图片的操作
      handleRemove(file) {
        // 1.获取将要删除的图片的临时路径
        const filePath = file.response.data.tmp_path
        // 2.从pics数组中,找到这个图片对应的索引值
        const i = this.addForm.pics.findIndex(x => x.pic === filePath)
        // 3.调用数组的splice方法,把图片信息对象,从pics数组中移除
        this.addForm.pics.splice(i, 1)
      },
      // 监听图片上传成功的事件
      handleSuccess(response) {
        console.log(response)
        // 1.拼接得到一个图片信息对象
        const picInfo = {pic: response.data.tmp_path}
        // 2.将图片信息对象，push到pics数组中
        this.addForm.pics.push(picInfo)
        console.log('addForm:', this.addForm)
      },
      // 添加商品
      add() {
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) {
            return this.$message.error('请填写必要的表单项！')
          } else {
            // 执行添加的业务逻辑
            // lodash cloneDeep(obj)
            const form = _.cloneDeep(this.addForm)
            form.goods_cat = form.goods_cat.join(',')
            // 处理动态参数
            this.manyTableData.forEach(item => {
              const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals.join(',')}
              this.addForm.attrs.push(newInfo)
            })
            // 处理静态属性
            this.onlyTableData.forEach(item => {
              const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals}
              this.addForm.attrs.push(newInfo)
            })
            form.attrs = this.addForm.attrs
            console.log('form:', form)

            // 发起请求添加商品
            // 商品名称，必须是唯一的
            const {data: res} = await this.$http.post(`goods`, form)
            console.log('res:',res)
            if (201 !== res.meta.status) {
              return this.$message.error('添加商品失败！')
            } else {
              this.$message.success('添加商品成功！')
              this.$router.push(`/goods`)
            }
          }
        })
      }
    },
    computed: {
      cateId() {
        if (this.addForm.goods_cat.length === 3) {
          return this.addForm.goods_cat[2]
        } else {
          return null
        }
      }
    },
    name: "Add"
  }
</script>

<style lang="less" scoped>
  .el-checkbox {
    margin: 0 10px 0 0 !important;
  }

  .previewImg {
    width: 100%;
  }

  .btnAdd {
    margin-top: 15px;
  }
</style>
